Examine source code of QuickOWL

{
  "name": "QuickOWL",
  "description": "Quickly Open Web Links using custom contextmenu with selected text as input",
  "version": "0.3.8",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{f58db651-64c6-46e8-a21c-d1d2ec992a9d}"
    }
  },
  "icons": {
    "16": "icons/link-solid-adaptive-16.png",
    "48": "icons/link-solid-adaptive-48.png",
    "128": "icons/link-solid-adaptive-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/link-solid-adaptive-16.png",
      "24": "icons/link-solid-adaptive-24.png",
      "32": "icons/link-solid-adaptive-32.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "menus",
    "storage",
    "unlimitedStorage",
    "downloads"
  ]
}